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At S and T are glands which provide a water seal against the inleakage of air and the outleakage of steam. U represents the flexible coupling to the generator. V is the overload or by-pass valve used for admitting steam to intermediate stage of the turbine. W is the supplementary cylinder to contain the low-pressure balance piston.
The desire of turbine manufacturers has consequently been to design a flexible coupling, capable of accommodating a certain want of alinement between the two spindles without in any way affecting the smooth running of the whole unit.
For this reason the engineer will readily perceive the great desirability of maintaining the vacuum at the highest possible point consistent with the satisfactory and economical operation of the condenser. The exhaust pipe should always be carried downward to the condenser when possible, to keep the water from backing up from the condenser into the turbine.
A new departure in these boats has been made by the introduction of "turbine" engines, which are much lighter and take up less room than engines of the ordinary type. These engines go at such a high rate of speed that four screw-propellers have to be provided to transmit the power efficiently. Turbine destroyers have attained a speed of 35 and a half knots, or nearly 41 miles per hour.
I had once been aboard of a turbine launch, and the black water was thrown up on either side of that whaleboat in a wave just as it had flowed away from the nose of the launch! This wave seemed to be three feet higher than the gunwale of the boat and as black as ebony. Even Tom Anderly cast a glance at the boat-hatchet as though he contemplated cutting the taut line.
There is no genuine duration, nothing really tending to evolution in Spencer's evolution: no more than there is in the periodic working of a turbine or in the stationary tremble of a diapason.
At the bottom of each wheel-pit a 5000 horse-power Girard double turbine is mounted on a vertical shaft, which drives a propeller shaft rising to the surface of the ground; a dynamo of 5000 horse- power is fixed on the top of this shaft, and so driven by it. The upward pressure of the water is ingeniously contrived to relieve the foundation of the weight of the turbine shaft and dynamo.
On varying and even on normal and steady full load, the steam is more or less reduced in pressure after passing through the governing valve D; a gage I must consequently be placed between the valve, preferably on the valve itself, and the turbine.
Once in the air, the downward blast from the tractor operated a turbine alternator mounted on a skeleton framework at the centre of the Ring, and the current supplied by this machine enabled the Ring to continue its flight indefinitely, or until the cylinder of uranium was completely disintegrated. Yet to trek back over the route by which he had come appeared to be equally impossible.
Although the conditions just cited are highly improbable in actual practice, it can at once be seen that to insure the safety of the condenser, absolutely, the turbine relief valve must be set to open at a comparatively low pressure, say 40 pounds by gage, or thereabouts.
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